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Ch.3 Vocab & Notes
Ch.3 Vocab & Notes
22
Science
7th Grade
10/18/2010

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Term
physical property
Definition
any characterisitc of a material that can be observed or measured without changing the identity of the material
Term
matter
Definition
anything that has mass and takes up space
Term
physical change
Definition
the physical properties of a substance change
Term
density
Definition
the amount of mass a material has in a given volume d = m/v label = g/cm^3 for density :: cm^3 for volume :: g for mass
Term
states of matter
Definition
solid liquid gas and plasma
Term
melting point
Definition
the temperature at which a solid beomces a liquid is its melting point
Term
boiling point
Definition
the temp. at which a substance in the liquid state becomes a gas
Term
chemical property
Definition
any characterisitc that gives a substance the ability to undergo a change that results in a new substance
Term
chemical change
Definition
a change in the idetnity of a substance due to the cehmical properties of that subtance
Term
law of conservation of mass
Definition
states that the mass of what you end with is always the same as the mass of what you start with
Term
metallic properties
Definition
luster
malleability
ductility
magnetism
Term
physical properties can be used to identify classify and seperate substances e.g. seperating the pennies seperating iron from sand how can you do that? magnet.
Definition
physical properties can be used to identify classify and seperate substances e.g. seperating the pennies seperating iron from sand how can you do that? magnet.
Term
chemical property - flammbilty 2. reacts with oxygen light water or other substances
Definition
chemical property - flammbilty 2. reacts with oxygen light water or other substances
Term
chemical change bubbles heat light smoke sounds color change
Definition
bubbles heat light smoke sounds color change
Term
mass is never lost or gained in chemical reaction factors ash gas smoke only relocated not lost material burned
Definition
mass is never lost or gained in chemical reaction factors ash gas smoke only relocated not lost material burned
Term
M V D
V V O = -
O V V = x
V O V = x
m/v = d
Definition
M V D
V V O = -
O V V = x
m/v = d
V O V = x
Term
color temperature smell taste density shape mass length volume magnetic melting point mallebility ductility state boiling point physical properties
Definition
color temperature smell taste density shape mass length volume magnetic melting point mallebility ductility state boiling point physical properties
Term
flammability reacts with oxygen water vinegar etc reacts in presence of electiricty light heat etc
Definition
flammability reacts with oxygen water vinegar etc reacts in presence of electiricty light heat etc
Term
physical change breaking glass forming a bar of copper into wire etc
Definition
physical change breaking glass forming a bar of copper into wire etc
Term
d = m/v
m v d
5 10 O
O 12 4

d= 5/10 = 2g/cm^3

12 x 4 = m/12 x 4 m = 48g
Definition
d = m/v
m v d
5 10 O
O 12 4

d= 5/10 = 2g/cm^3

12 x 4 = m/12 x 4 m = 48g
Term
oxygen reacting with iron creates rust
Definition
oxygen reacting with iron creates rust
Term
water displacement
Definition
volume by immersion
forumla V2- V1 (v2 second volume, v1 initial volume)
e.g. start v1 as 20 mL
u put object in v2 is 25mL so v2 - v1 is 5 mL. the volume by immersion is 5mL
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